Mobile device signal booster



FIG. 1 is a front perspective view of the presently claimed design.

FIG. 2 is a front view of the presently claimed design.

FIG. 3 is a rear view of the presently claimed design.

FIG. 4 is a side view of the presently claimed design.

FIG. 5 is an opposite side view of the presently claimed design.

FIG. 6 is a top view of the presently claimed design; and,

FIG. 7 is a bottom view of the presently claimed design.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a mobile device signal booster, as shown and described. 